DLT714-2000汽轮机叶片超声波检验技术导则.pdf

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1、汽轮机叶片超声波检验技术导则DL/T714-2000DL/T714-2000目次前言·······································，···········································⋯⋯15891范围······················································································⋯⋯15902引用标准··························

2、·······················································⋯⋯15903术语···························································································‘二15904总则···················································，·····································⋯⋯15

3、905仪器、探头和试块······································‘······································⋯⋯15916检验技术条件选择··································。··········································⋯⋯巧引7检验报告····························，················。······················

4、·················⋯⋯1594附录A(标准的附录)汽轮机叶片超卢检验灵敏度及动态波形······················⋯1594附录B(提示的附录)国产(125一300)MW机组汽轮机叶片、叶根配置······⋯⋯15991589Dl,/T714-2000前言本标准是根据原电力工业部电力行业标准制、修订计划(技综[1996]40号)的安排制定的运行中汽轮机叶片处于极复杂的应力状态，往往由于叶片(叶身和叶根)设计不合理，材料不符合要求，机加工质量不佳，组装工艺不良，运行L况变动等因素的

5、影响造成叶片断裂事故。对叶片尤其是叶根进行预防性检查是消除设备隐患，确保机组安全运行的重要手段。长期以来，许多单位为了搞好这项工作，做了大量的试验研究。尤其目前大量老机组仍然在超期服役，大容量新机组相继投运，叶片的断裂时有发生，本标准的制定为叶片无损检测提供了技术依据，同时提高了检测的准确性，尽可能避免和减少因误判而造成的不必要损失本标准附录A是标准的附录，附录B是提示的附录。本标准由电力行业电站金属材料标准化技术委员会提出并归口。本标准起草单位:国家电力公司热工研究院、西北电力试验研究院、江苏电力试验研究所

6、、常熟电厂、甘肃电力试验研究所、台州电厂。本标准主要起草人:吴前驱、白小云、于强、王世华、吴凯、张明非、徐大鹰。本标准委托电力行业电站金属材料标准化技术委员会解释巧89中华人民共和国电力行业标准汽轮机叶片超声波检验技术导则DI,/T714-2000Technicalguidefurtheultrasonictestingofturbine-blades1范围本导则规定了火电厂在役机组检修时，使用A型脉冲反射式超声波探伤仪，以单探头接触法为主进行汽轮机叶片(叶身及叶根)的超声波检验和判定方法。本导则适用于火力发

7、电厂600MW以下汽轮机叶片的叶身和叶根超声波检验。其他类似叶片可参照使用。2引用标准下列标准所包含的条文，通过在本标准中引用而构成为本标准的条文〔本标准出版时，所示版本均为有效。所有标准都会被修订，使用本标准的各方应探讨使用下列标准最新版本的可能性G工3/1'12604.1-1990无损检测术语超声检测JB/1'10061-1999A型脉冲反射式超声波探伤仪通用技术条件JBiI'10062-1999超声波探伤用探头性能侧试方法Jli/1'10063-1999超声波探伤用1号标准试块技术条件3术语本标准术语除

8、按GI3/I'12604.1外，还采用下列术语:3.1探头前沿frontdistance人射点至前沿的距离，用;0表示3.2外露尺寸externaldimensions叶根露在轮缘外部的尺寸，用h。表示，见图2(a)3.3斜面宽度bevelwidth叶片毛作部分过渡到叶根的斜面宽度，用a表示一般此斜面都略带凹形弧面，见图2(a)=3.4肩台高度highofrootshoulder叶根外露部分有的与叶